Question

我是sprite kit 2d游戏开发的新手。它现有的swift2项目运行良好，但不幸的是更新后的swift4流程代码出错。我该如何解决这个问题

class SGScene : SKScene {
      override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch: AnyObject in touches {
            //let location = touch.locationInNode(self) //swift2
            let location = touch.location(self) //getting error update Xcode suggestion
            screenInteractionStarted(location)
        }
    }

       func screenInteractionStarted(_ location : CGPoint) {
            /*Overridden by Subclass*/
        }
}

目前我尝试更新此项目swift4

Answer 1

用以下方法替换您的方法：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    touches.forEach { touch in
        let location = touch.location(in: self)
        screenInteractionStarted(location)
    }
}

Answer 2

您缺少参数名称：in。重申这一行：

let location = touch.location(self)

使用：

let location = touch.location(in: self)

它会起作用。

全班：

import Foundation
import SpriteKit

class SGScene : SKScene {
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            let location = touch.location(in: self)
            screenInteractionStarted(location)
        }
    }

    func screenInteractionStarted(_ location : CGPoint) {
        /*Overridden by Subclass*/
    }
}

不能称之为非功能类型的价值＆＃39; CGFloat＆＃39;

2 个答案: